Discrete math- Range and preimage of the floor function

Can you explain how to answer these questions i have the final answer but i don't know how they reach to it


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  • Erdos Erdos

    Let me know if you need any clarifications.

    • Sara Sara

      Thank you! But for b in the book it says the answer is [5,7)?

    • Erdos Erdos

      The answer is actually [5,7). In the last line I had written the wrong numbers. I have revised the solution.

The answer is accepted.
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